Question

If a-b= 6 and ab = 20 find a^3 -b^3

Answer 1

Given,
a-b=6
ab=20
Then,
a³-b³=(a-b)(a²+ab+b²)
=6(a²+20+b²)
=6a²+120+6b²

I think that's right.

Hope this helps you!

Answer 2

Hey there!
Praneeth from Brainly.in here to help!
Given
➻ ab=20,

➻ (a-b)=6

➟ (a-b)³=a³-b³-3ab(a-b)

➟ (a-b)³=a³-b³-3a²b+3ab²

➟a ³-b³=(a-b)³+3ab(a-b)

➺ 6³+3*20(6)

➺ 216+360

➺ 576

∴a³-b³=576
hope helped!